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1Author    Sabine Rings3, Vladislav Ischenkob, Martin Jansenb, Sonderdruckanforderungen An, ProfM. JansenRequires cookie*
 Title    Darstellung und Strukturanalyse von Lithium- [tetrakis-(methylamino-)aluminat] Preparation and Crystal Structure of Lithium[tetrakis-(methylamino-)aluminate]  
 Abstract    The preparation and spectroscopic data of the new ternary amide LiAl(NHCH3)4 are reported. The structure of the title compound has been determined from X-ray powder diffraction data (tetragonal, 14,, a = 14.000(4) A, c = 9.275(2) A, 210 reflections, R = 3.75%, weighted R = 5.10%). Both the lithium and the aluminium atoms are coordinated tetrahedrally by nitrogen atoms. Edge-sharing pairs of lithium centered and aluminium centered tetrahedra are connected to each other in helical chains forming a 3D-framework via the remaining vertices. A comparison of the projection of the crystal structure of LiAl(NHCH3)4 along the c-axis to those of cristobalite and of hollandite, (Ba,K)2 (M n,Fe)80 16, reveals similarities with respect to both the connectivity and the topology of ring structures. 
  Reference    Z. Naturforsch. 55b, 730—734 (2000); eingegangen am 20. April 2000 
  Published    2000 
  Keywords    Amides, Lithium, Aluminium 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0730.pdf 
 Identifier    ZNB-2000-55b-0730 
 Volume    55 
2Author    H. Jacobs, E.Von OstenRequires cookie*
 Title    The Crystal Structure of a New Modification of Potassium Amide, KNH2  
 Abstract    In the temperature range from 54 to 75 °C a new modification of KNH2 was found, which crystallizes tetragonally a — 4.282 ±0.003 A, c = 6.182 ±0.003 A, and c/o= 1.444 (60 °C), in P 4/nmm -No. 129-, Z = 2, 2 K in 2c 0 1/2 z, z = 0.202(5), 2 N in 2c 0 1/2 z, z = 0.737(15). Its structure is of a deformed sodium chloride type. 
  Reference    (Z. Naturforsch. 31b, 385—386 [1976]; eingegangen am 24. November 1975) 
  Published    1976 
  Keywords    Potassium-Compound, Crystal Structures, Amides 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0385_n.pdf 
 Identifier    ZNB-1976-31b-0385_n 
 Volume    31 
3Author    S.N SRequires cookie*
 Title    Influence of Aqueous Mixtures of Amides on the Kinetics of Electro Reduction of N i(II) and C o(II) at d. m. e  
 Abstract    Electroreduction of N i(II) and C o(II) lias been carried out in aqueous mixtures of formamide, acetamide and urea. Electrode kinetics in terms of theories of irreversible waves have been studied. After calculating the rate constants by D e l a h a y 1 and K o u ­ t e c k y 2 treatments separately their variation with electrode potential has been used to calculate the product 'ana\ The rate constants and 'ana' calculated from two different approaches show remarkable agreement. 'ana amide content of the aqueous mixture. 
  Reference    (Z. Naturforsch. 30b, 859—861 [1975]; received July 17 1975) 
  Published    1975 
  Keywords    Amides, Kinetics, Electro Reduction, Cobalt, Nickel 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0859.pdf 
 Identifier    ZNB-1975-30b-0859 
 Volume    30 
4Author    Yüniu Bai, M. Athias Noltemeyer, H. Erbert, W. RoeskyRequires cookie*
 Title    Synthese und Strukturen von Monoalkylamiden und -imiden des Titans Synthesis and Structures o f M onoalkylam ides and -imides of Titanium  
 Abstract    A new method for the preparation o f m onoalkylam ides o f com position Cp'TiCl2N H R is reported. M e3SnN H R (R = /Bu l a , CH/Pr-, lb) reacts with Cp'TiCl3 with elimination o f M e3SnCl to yield Cp'TiCLNHR (2) (2a: Cp' = C 5H 5, R = /Bu, 2b: Cp' = M e3SiC5H 4, R = t Bu, 2c: Cp' = (M e3Si)?C 5H 3, R = /Bu, 2d: Cp' = M e4C5H, R = /Bu, 2e: Cp' = M e5C5, R = t Bu, 2f: Cp' = C5H 5, R = CH/Pr2, 2g: Cp' = M e3SiC5H 4, R = CH/Pr2, 2h: Cp' = (M e3Si)2C5H3, R = CH/Pr2, 2i: Cp' = M e4C5H , R = CH/Pr2, 2j: Cp' = M e5C5, R = CH/Pr2). Compounds 2 a -2 j are stable and eliminate HC1 only in the presence o f a strong base to form (C5H 5T iC lN /B u)2 (3a) or (M e3SiC5H4T iC lN /B u)2 (3b) from 2 a and 2b, respectively. In 3a the chlorine atom s are substituted by N H /B u groups in boiling T H F by means o f L iN H /Bu to give (C5H 5T iN H /B uN /B u)2 (4). The reactions o f 2 e and 2b with L iN (SiM e3)2-Et20 in the presence o f pyridine yield M e5C5T iC lN /B u • Py (5 a) (Py = pyridine) and M e3SiC5H4T iC lN /B u P y (5 b), respectively. Com pounds 2 e and 5 a have been characterized by X-ray crystal structural analysis. 
  Reference    Z. Naturforsch. 46b, 1357 (1991); eingegangen am 22. März 1991 
  Published    1991 
  Keywords    X -Ray, Synthesis, Titanium, Amides, Imides 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1357.pdf 
 Identifier    ZNB-1991-46b-1357 
 Volume    46 
5Author    Feng-Quan Liu, Hans-Georg Schmidt, M. Athias Noltemeyer, Cristina Freire-Erdbrügger, GeorgeM. Sheldrick, HerbertW. RoeskyRequires cookie*
 Title    Synthesis and Structure of Eight-Membered Titanium Containing Siloxane Rings  
 Abstract    The preparation by different methods o f the eight-membered ring com pounds (R 'X T i0S iR 220) 2 is reported: (2: R' = C5H 5, X=C1, R2=/Bu; 3: R '= N (S iM e3)2, X=C1, R 2=/Bu; 4: R' = C 5M e5, X = C1, R 2=Ph; 6: R' = X = N E t2, R 2=fB u). The six-membered ring Ph2SiO[OTiC5M e5(Cl)]2 5 is formed together with 4 by the reaction o f C5M e5TiCl3 and Ph2Si(OLi)2. Com pounds 2 and 4 have been characterized by X-ray structural analysis. 
  Reference    Z. Naturforsch. 47b, 1085—1090 (1992); received March 2 1992 
  Published    1992 
  Keywords    Organotitanium, Amides, Siloxanes, Eight-Membered Rings 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1085.pdf 
 Identifier    ZNB-1992-47b-1085 
 Volume    47 
6Author    Z. NaturforschRequires cookie*
 Title    Lanthanoiden-Komplexe, IX [1]  
 Abstract    Reaktivitätsbestimmender Einfluß der Ligandenkonstitution bei Seltenerdamiden: Herstellung und Struktur sterisch überladener Alkoxid-Komplexe L anthanoid Com plexes, IX [1] Reactivity C ontrol o f L an th an o id A m ides through Ligand Effects: Synthesis and S tructures of Sterically C ongested Alkoxy Com plexes W olfgang A. H errm an n * , R ein er A nw ander, Florian C. M unck, W olfgang Scherer, V eronique D u fau d 3, N o rb ert W. H u b e rb, G eorg R. J. A rtus It is shown that the introduction o f sterically demanding ligands in lanthanoid metal com ­ plexes can depend more on the precise composition of the lanthanoid precursor than on the size of the new ligand. Thus, tris(r-butyl)methanol ("tritox-H ") does not react with the amides Ln[N(SiM e3) 2 ] 3 of the "late" (small) lanthanoid metals. However, fast and clean reactions occur with the sterically less demanding derivatives Ln[N(SiHM e2)2]3, with new homoleptic com plexes Ln(tritox)3 (Ln = Y, Nd) being formed with practically all metals o f this group of elements. The molecular and crystal structures of some lanthanoid amides and alkoxides are described. 
  Reference    Z. Naturforsch. 49b, 1789—1797 (1994); eingegangen am 30. März 1994 
  Published    1994 
  Keywords    Lanthanoid Complexes, Alkoxides, Amides, Synthesis, Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1789.pdf 
 Identifier    ZNB-1994-49b-1789 
 Volume    49 
7Author    EvgeniV. Avtomonov, KonstantinA. RufanovRequires cookie*
 Title    Zirconium Reagents for Organometallic Synthesis. Crystal Structures of ZrCl4*2Et20 and (Et2N)ZrCl3*Et20  
 Abstract    Reaction of 3 equivalents of ZrCU-2Et20 (1) with 1 equivalent of (Et^N ^Zr in diethyl ether readily affords crystalline (Et2N)ZrCl3-2Et20 (2) in almost quantitative yield. The product was characterised by elemental analysis and by 1H. 1 C NMR, and MS techniques. The reactivity of this reagent towards C-H acidic compounds has been studied using cyclopentadiene as a C-H acid. The crystal structures of both 1 and 2 have been determined by X-ray diffractometry. The coordination polyhedra reveal a nearly perfect octahedral geometry with a trans Et20 ligation for 1 and a cis one for 2. 
  Reference    Z. Naturforsch. 54b, 1563—1567 (1999); received July 7 1999 
  Published    1999 
  Keywords    Zirconium, Adducts, Amides, Organometallic Reagents, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1563.pdf 
 Identifier    ZNB-1999-54b-1563 
 Volume    54 
8Author    H. Möhrle, M. JeandréeRequires cookie*
 Title    Chinazolinderivate durch Cyclodehydrierung von N-(2-substituierten Aryl)-Piperidinen Quinazoline Derivatives by Cyclodehydrogenation of N-(2-Substituted Aryl)-Piperidines  
 Abstract    D ehydrogenation of the N-[2-(aminocarbonyl)phenyl]piperidines 1 -5 using H g(II)-EDTA, generated the quinazolinones 6 -9 . Increasing size of the 4-substituent in the piperidine de­ creased the oxidation rate and the product yield. N-[2-(Hydroxyiminomethyl)phenyl]piperidines 18-22 showed a different behaviour. While 18 with H g(II)-ED TA in water produced the oxime lactam 24 in quantitative yield, the 4-substituted piperidines 19-21 caused not only a lower reaction rate but also an altered pro­ duct pattern. The double dehydrogenation to lactams was reduced and the cyclic nitrones, formed by two electron withdrawal, became dominant. From the spiro compounds 21 and 22, solely the quinazoline-N-oxides 29 and 30 resulted. The mechanism of the reactions is discussed. 
  Reference    Z. Naturforsch. 54b, 1577—1588 (1999); eingegangen am 31. August 1999 
  Published    1999 
  Keywords    Amide, Oxime, Nitrone, Neighboring Group Participation, M ercury(II)-EDTA D ehydrogenation 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1577.pdf 
 Identifier    ZNB-1999-54b-1577 
 Volume    54 
9Author    IvanS. Alferiev, Sergey Yu, BobkovRequires cookie*
 Title    Cyclic Oligophosphonic Anhydrides Stable in Aqueous Media  
  Reference    Z. Naturforsch. 47b, 1213—1224 (1992) 
  Published    1992 
  Keywords    Amides, Phosphonylation, l-Alkylaminoalkane-l, l, 3, 3-tetrayl-tetrakis-phosphonic Anhydrides, Cyclic Dimeric Anhydrides, l-Aminoalkylidene-l, l-bis-phosphonic Acids 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1213.pdf 
 Identifier    ZNB-1992-47b-1213 
 Volume    47